Pityriasis
Encyclopedia
Pityriasis commonly refers to flaking (or scaling) of the skin
. The word comes from the Greek πίτυρον "bran
".
Skin
-Dermis:The dermis is the layer of skin beneath the epidermis that consists of connective tissue and cushions the body from stress and strain. The dermis is tightly connected to the epidermis by a basement membrane. It also harbors many Mechanoreceptors that provide the sense of touch and heat...
. The word comes from the Greek πίτυρον "bran
Bran
Bran is the hard outer layer of grain and consists of combined aleurone and pericarp. Along with germ, it is an integral part of whole grains, and is often produced as a by-product of milling in the production of refined grains. When bran is removed from grains, the grains lose a portion of their...
".
Classification
Types include:- Pityriasis albaPityriasis albaPityriasis alba is a common skin condition mostly occurring in children and usually seen as dry, fine-scaled, pale patches on the face. It is self-limiting and usually only requires use of moisturizer creams....
- Pityriasis lichenoides chronicaPityriasis lichenoides chronicaPityriasis lichenoides chronica is an uncommon, idiopathic, acquired dermatosis, characterized by evolving groups of erythematous, scaly papules that may persist for months.- Causes :Pityriasis...
- Pityriasis lichenoides et varioliformis acutaPityriasis lichenoides et varioliformis acutaPityriasis lichenoides et varioliformis acuta is a disease of the immune system. It is the more severe version of Pityriasis lichenoides chronica...
- Pityriasis roseaPityriasis roseaPityriasis rosea is a skin rash. It is non-dangerous but may inflict substantial discomfort on some people...
- Pityriasis circinata
- Pityriasis rubra pilarisPityriasis rubra pilarisPityriasis rubra pilaris refers to a group of chronic disorders characterized by reddish orange, scaling plaques and keratotic follicular papules...
- Pityriasis versicolorTinea versicolorTinea versicolor is a condition characterized by a rash on the trunk and proximal extremities. Recent research has shown that the majority of Tinea versicolor is caused by the Malassezia globosa fungus, although Malassezia furfur is responsible for a small number of cases...
- DandruffDandruffDandruff is the shedding of dead skin cells from the scalp . Dandruff is sometimes caused by frequent exposure to extreme heat and cold. As it is normal for skin cells to die and flake off, a small amount of flaking is normal and common; about 487,000 cells/cm2 get released normally after...
, historically called Pityriasis capitis - Pityriasis AmiantaceaPityriasis amiantaceaPityriasis amiantacea is an eczematous condition of the scalp resulting in hair loss in which thick tenaciously adherent scale infiltrates and surrounds the base of a group of scalp hairs....